Disheartened - Null for Hire, #2

My name is Holly James, and I'm a null, which means I obliterate magic. Somehow, I've managed to turn my freakish power into a thriving null-for-hire business. I spend my days babysitting magical Others with anger management issues and mediating contracts between rival shifter clans. When my boyfriend, Council Inspector Cade McAllister, discovers his latest murder case is entwined with one of my clients, I join him in the hunt for a killer.
One who rips the hearts out of his victims. And if that wasn't enough, a strange phenomenon is infecting magic in areas around Tulsa. Spells start backfiring, shifters can't change, and entire covens are in total meltdown. I don't know what's causing the chaos, but even I can't nullify it. Though the infection impairs Cade's magic, we have to find this killer. Because it's only a matter of time before he adds another heart to his collection.